On Tuesday, we posted an audio recording of a mystery car’s exhaust note. To hear it again, click play above. None of the commenters were able to figure out that this week’s sound came from the Smart Fortwo. While we could insert a “Smart” pun in here, we will instead acknowledge that a Smart sounds much better than you might expect, which may have been what misled so many of you.

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Like that sound? Download the MP3 and quiz your friends, make your own ringtone, or just lull yourself to sleep with sweet, sweet vehicular ear candy.